Park effects are not annual. They are averaged over 3-5 years.
As for the innings. are you talking annual or career? Given how difficult it is for pitchers to pitch deep into games now, I believe innings have become more valuable now and should be rewarded more than ever for single seasons. For historic WAR, the value of the cumulative effect of WAR is questionable. It depends on whether you favor peak value or career value. If you like peak value more, then you can use WAA (Wins above average). In this case, a pitcher can not accumulate value unless he is better than average.
I do agree WAR should not be gospel and that it is overused